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About Darn Tough We live and work in Vermont. Our backyard is the perfect testing ground to make the finest Premium All Weather Performance Socks. We ski, snowboard, hike, bike and run in the most unforgiving climate in the lower 48. It is under these conditions that we design, test and manufacture our socks. About the Product Add the perfect addition to your sport wear with the Darn Tough Fast Back 1/4 Sock Light Cush. This super breathable sock constructed for heavy duty training is made from genuine merino wool for a durable and breathable feel. Offered in multiple colors to choose from, the Darn Tough Fast Back 1/4 Sock Light Cush features a True Seamless construction. Add soft breathability and light cushioning to you daily run with the Darn Tough Fast Back 1/4 Sock Light Cush.